Brace and bit therefor



Sept. 24, 1929.

R. DONZE BRACE AND BIT THEREFOR iled Aug. 5, 1926 iff/Qi Patented Sept.24, 1929 PATENT OFFICE RAY DONZE, OF KITTA'NNING, EENNSYLVANIA BRACE ANDBIT THEREFOR Application filed August 5, 1926.

This invention relates to certain improvements in braces and bitstherefor and the primary object of the present invention is to soconstruct the brace and the bit as to pre- 5 vent the latter from beingunintentionally removed when in operation or out of operation.

A further obj ect of the present invention is to so construct the bitand its jaws that the latter is prevented from becoming detached l0i'rom 'the head of the brace when the bit is removed7 whereby they arealways in position to receive the bit.

A further improvement is to construct the bit with an enlarged inner endthat engages L5 projections on the jaws that will prevent the bit frombeing removed from the brace accidentally.

A further improvement of the present invention is to make the outer endset the jaws 0 of greater dimension than the dimension or the opening inthe head ot the brace, whereby the jaws are always retained within thebrace to receive the said bit.

Further improvements will appear from :5 the following description:

Figure l is a de elevation oi a brace showing my improvement in thebrace and in the bit.

Figure 2 is a horizontal view on the line 3 2 2 of Figure 1.

Figure 8 is a vertical horizontal sectional view through the end of thebit and the outer ends of the aws.

Figure 4 is an enlarged side elevation of 5 the inner end ot my improvedbit.

Figure 5 is a detached perspective view showing the outer end of one otmy improved bit jaws.

ln the accompanying drawings. l is a bit having at its outer end theusual screwthreaded hollow body 2. Placed within the hollow head and thehollow portion ot the brace l is my improved construction of aws 3, ofwhich there are two in number, as is usual in braces of thisconstruction.

Each one of these aws 8 has its outer end 4 enlarged and the inner edgeof the enlarged portion 4 is provided with a longitudinal groove 5having its inner end forming a l shoulder 6, and the inner end of thejaw 7 SeriaI No. 127,465.

reduced and extending wit-hin the brace and the head 2.

My improved bit is constructed to lit in the groove 5 and is also tocooperate with the shoulder 6 for the purpose to be now eX- f plained.

Attention is called to the construction ot bit shown in Figure 4. Thisconsists in forming an extremity or" the bit with enlarged head 9, thehead bearing against the shoulder 6 as shown in Figures l and 3. Theinner extremity l0 of the bit is tapered, and the taper is preferablyangular in cross section. Formed on the bit between the head 9 and thebit 8 proper is an enlargement ll that in cross section is madesubstantially oval as shown in Figure 2. The edges of this oval portionll are preferably tapered to points l2 and these points fit into thegrooves 5 of the jaw portions 4. 7(

In Figure l it will be observed that the jaws 3 have their enlarged ends4 of a size which will prevent them from passing through the opening 13formed in the head and through which opening the bit 8 proper 7 passeswhen the parts are in operative position. This opening 13 is largeenough to permit the enlargements ll and 9 of the bit to pass through itwhen being placed in position in the head 'of the brace.

F rom the foregoing description and c0nstruction as shown7 it will benoted that the shoulder 6 at the inner end ot the bit will prevent itfrom being accidentally removed from the brace. For instance in turningthe same 85 backward and at the same time pulling outward to remove thebit from a drilled hole, the bit cannot be accidentally removed evenshould the head become loosened. Attention is also directed to the factthat the oval or substantially diamond shaped portion ll engaging thegrooves 5 will prevent the bit from turning even though the jaws beloose in their engagement with the bit.

Attention is also directed to the fact that when the bit is removed thejaws 3 cannot by accident fall out through the opening 13 since theopening is smaller than the enlarged head of each of the aws.

The head 2 is substantially of ordinary construction, its inner portion14 being tapered and adapted to engage the outer edges 15 of the jawsfor forcing the latter together and thus clamping the bit in positiontherein.

The foregoing construction can be changed or modilied within certainlimits without departing from the spirit and scope of my presentinvention, so long as such change is within a fair interpretation of theappended claims. v

Having thus described my invention, what I desire to claim and seeure byLetters Patent of the United States is:

l. An improved brace and bit therefor, said i bit comprising a stemhaving adjacent its upper end a portion angular in Vcross section, theend of the bit above said angular portion terminating in an enlargedhead, the brace provided with an adjustable head carrying jawsoperatable thereby, said jaws being longitudinally grooved and saidgrooved portions adapted to engage the angular portion ot the bit andlock it against rotation, and the jaws above said grooves being reducedto receive and interlock with the enlarged head of the bit to hold thebit against outward movement from said brace head.

2. An improved brace and bit therefor, said bit provided with a stemhaving an enlarged portion angular in cross section surmounted by anenlarged head having tlattened portions at its base and adjacent itslower end, said brace provided with an adjustable head carrying jawsoperatable thereby,

lsaid jaws being longitudinally grooved and said grooved portionsadapted to interlock with the angular' portion of the bit to prevent thebit from rotating, and said jaws above said grooves being reduced andprovided with L-shaped flattened shoulders adapted to receive and engagethe flattened portions of the enlarged bit head to prevent the outwardmovement oit the bit.

ln testimony whereof I hereunto aliix my signature.

RAY DONZE.

